(1) Comparison with other Displa y devices
(2) World Display Market Trend
(3) LCD TV Market trend
(4) Guidance of handling LCD product
(5) Abbreviations
3. LCD TV Structure
(1) General Specifications
(2) Presentation for SVC Engineer
2
Page 3
1. LCD Technology
1) What is TFT LCD ?
2) Structure of TFT LCD
3) TFT-LCD Operating Mechanism
4) Operating Theor y
5) Structure LCD Module
6) Structure of Back light
7) Function of Back light
8) Key Parts ; Color Filter, Polarizer
3
Page 4
What is TFT(Thin Film Transistor)?
TRANSISTOR
(MOS-FET)
DRAIN
V
th
GATE
SOURCE
When supply over certain voltage(Vth) to
the GATE, it delivers information from
Drain to Source
SWITCHING Characteristics
TFT Panel
TFT Element
TFT
DRAIN
V
th
GATE
SOURCE
TPE
Compound Transistor with thin film in every Pixel
on ITO.
Independent on neighboring Pixel
TFT Cross section
Semi-Conductor
Insulator
Transparent Pixel Electrode
SOURCEDRAIN
GATE
Glass Panel
4
Page 5
Structure of TFT- LCD
%
% (Approx....)
300
%%
One Pixel
)
Common Electrode
)
Pixel Electrode
Data Line
Gate Line
!
! Liquid Crystal
!!
Control the amount
of light by the
Applying Voltage
C/F Glass
TFT Glass
TFT LCD
Panel
#
# Source
##
Transport the
Data Signal
Glass
++++
-
--
+
"
" Gate
""
On/Off the
TFT
Glass
Back Light
-
--
$
$ Pixel
$$
Applying
Voltage
to the
Liquid Crystal
Polarizer
Liquid
Crystal
------
White (TFT Off)Black (TFT On)
5
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TFT- LCD Operating mechan is m
The structure of TFT-LCD is that Liquid Crystal is being filled betw een C/F Glass & TFT Glass. One Pixel consists of 3
sub-Pixels(R,G,B) and according to the number of the pixels, Display Resolution (SVGA,XGA,etc) is determined.
The TFT Matrix consists of Data Line(Carrying display data signal),Gate Line(Carrying signal for turn On/Off the
TFT).Each TFT, on each sub-pixel, controls the amount of Applying Voltage between C/F glass electrode & TFT glass
electrode for the Liquid Crystal.
The Applying Voltage changes the Direction of Liquid Crystal w hich changes direction of the Light. Transmittance rate
of the Polarized Light, polarized by Polarizer, is controlled by Applying Voltage. As a conclusion, Displayed Light is now
under-control of Display Data Signal.
Same structure as bellow diffuser, Protect the
top prism
Same function as bottom prism, Increase the
luminanc e up to 1.3 3 ti mes o f bott o m pri s m
Concentrate the light and increase the luminance
up to 1.55 times of the light guide
Uniform and concentrate the light received
from light guide
Lamp Housing(Lamp Reflector)
Pattern(Dot/Shibo/V-cut)
Light guide
(Flat/Wedge)
Reflector
Guide the light from lamp and uniform the light
Reflect the leakage light from light guide to reduce
the loss of the light injected to the light guide
11
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Key Parts : Color Filter
To realize color of the Display, array Red,Green & Blue color paint beneath Upper Glass Panel regularly in
accord with Pixel electrode of lower Glass Panel.
! Kinds of Pixel Array
' Delta Array
( Stripe Arra y
! The Function of Color Filter
Divide the white light from luminous source into Red, Green & Blue
Pixel
White Light
) Mosaic Array
Common Electrode
Glass
BRG
12
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Key Parts : Polarizer
A kind of filter, which polarize light one direction.
Light
Polarizer
<Passing>
<Blocking>
13
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Key Parts : Back Light
Back Light Unit,located behind TFT-Panel lower Glass, and supplies light to the PANEL.
CCFL LAMP
(Cold Cathode Fluorescence Lamp)
LAMP
AC 1000V
Inverter
Direct Type
Structure
LAMP
LCD Panel
CASE
Can realize White Light
Long life time(Appr. 25,000HRS)
Simple Brightness control
Small Size
: Very Good(Possible to realize)
: Good(Hard to reali ze)
: Bad(Impossible to realize)
17
Page 18
World Display Market Trend
60”
50”
Projector
P
40”
30”
20”
10”
Market 1
LCD
Small AV System
NTPC : NoteBook PC
D
P
LCD
CRT
Market 3
LCD
Market 2
NTPC***MonitorLarge AV System
18
Page 19
LG LCD TV Market Trend
K
7000
6000
World Market
World Market LCD TV
7000
Volume
5000
4000
3000
2000
1000
4000
2000
1000
250
0
200020012002200320042005
500
Years
Source : IDC JAPAN
19
Page 20
Guidance of handling Color TFT LCD Module
Color TFT LCD Module is very sensitive both electrically and physically.Users, therefore,
are requeste d t o follow the “Guida nce of handling color TFT LCD Module” on the followings.
1
Be careful not to make scratch
on the polarizer.
- Surface of polarizer is soft and can be
physically damaged easily.
- Please do not touch, push or rub polariz er
surface with materials over HB hardness.
2
- Please wear rubber glove when touch the
surface of LCD scr e en.
- Please use soft and anti-static material
with n-Hexane as cleaner.
3
- Water on/in the LCD may cause electrical
short or corrosion.
- Please wipe out or dry wate r carefully.
4
Keep clean the surface.
Keep out of water.
Prevent swift Temperature
5
High temperature & high humidity
reduce the life-time.
- LCD is not proper to be used at high te m p erature and high humidi ty.
- Please keep specified temperature and
humidity condition.
6
- Corrosive gas effect the polarizer and the circuit
chemically and cause defe cts ac cordingly.
7
- There are electro-static sensitive components such as
CMOS in LCD Module.
- Please earth human body when handle the LCD.In addition,
please do not touch the interface connector pin w ith b are
hand.
8
Keep out of Corrosive Gas.
Electrostatic discharge can make damage
Do not operate for a long time under
& Humidity change.
- Swift temperature and/or humidity change
can make dew or ice which caus e
nonconformance such as malfunction.
the same pattern.
- Operating LCD for a long time under the same pattern
can cause image persistence and can damage it.
- Please fol low following guidance.
1. Turn the power off when do not use.
2. Change the patter n pe riodically.
20
Page 21
Abbreviations
Abbreviations on LCD Module and TV
NoTermsFull Description
1ACFAnisotropic Conductive Fil m
2B/LBack Light
3CCFLCold Cathode Fluorescent Lamp
4CFColor Filter
5CRContrast Ratio ( White / Black )
6FPDFlat Panel Display
7LCLiquid Crystal
8LCDLiquid Crystal Display
9LCMLiquid Crystal Module
10LDLine Defect
11MNTMonitor
12POLPolarizer
13PixelPicture Element
14TABTape Automatic Bonding
15TCPTape Carrier Pack ag e
16TFTThin Film Transistor
21
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LG LCD TV
1) General Specification
- Key Value
- Specifications
- Moni tor Features
- Unique F eatures
2) Presentation for SVC Engineer
- Specifications
- Exploded View
- Interconn ectio n Guide
- Block Dia gram
- IIC Adjustment
- MICOM Pinning & Descriptions
- Video Processing
- Audio Processing
22
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General Specifications
LE/LL/LT-15A10
Key Value
KEY VALUE
-. Great Design . Modern Style
. Slim
. Free space
1. Connect the sign al cable from the monitor out socket of
the personal computer to the input socket of the set.
2. Connect the audio cable from the PC to the Audio socket
of the set.
3. Press the TV/AV/PC button to select PC Mode
4. Switch on the PC Mode, and the PC Screen automatically
appears on the set. The set can be operated as the PC monitor.
Note :
1. Check the P C Mode before exchanging the new monitor(LG),
the PC Mode should be within a mode in the table listed .
If over XGA mode, after change the PC mode to one mode of
table listed ( If possible, use the 1024 X 768 @60Hz
video mode to obtain the best image quality for you.
and then exchange the monitor ).
2. When the PC screen appears on the set, some message may
be appear on the screen, and the message is different depend
on Window system version( Win98,2000 )--Next Page
3. If you have an Apple Macintosh, connect the VGA adaptor
block from the 3 row 15 pin to 2 row 15 pin with the signal
cable and connect the VGA adaptor block to the Macintosh.
The cable are not supplied, such as the signal cable, audio
Soft Touch control system, LG’s advanced technology, leads customers to the emotional satisfaction.
Its main characteristics are Anti-static function when touching besides softness & luxurious looking.
- One 20.25 M H z cr ystal, few external com p onents
- Embedded RISC controller(80 MIPS)
2
-I
C Bus inte rface
- Single 5V power supply
- Submicrom COMS technology
- 64 pin PSDIP pa ckage
38
Page 39
Block Diagram
CIN1
VIN1
VIN2
VIN3
VIN4
VOUT
RGB/
YCbCr
FB
RGB/
YCbCr
Analog
Front End
AGC,
2*ADC
ANALOG
Component
Front-End
4 x ADC
Y/G
U/B
V/R
FB
Adaptive
Comb
Filter
NTSC
PAL
Processing
Matrix
Contrast
Saturation
Brightness
Tint
Y
Cr
Cb
FB
Color
Decoder
NTSC,
PAL,
SECAL
Saturation
Tint
Y
Cr
Cb
MIXER2D Scaler
PIP
Panorama
Mode
Contrast
Brightness
Peaking
I2C BUS
Clock
Gen.
Output
Formatter
ITU-R 656
ITU-R 601
Memory
Control
SYNC
+
Clock
Generation
Y OUT
CrCb OUT
YCOE
FIFO
CNTL
LL Clock
H Sync
Vsync
CNTL
AVI0
20.25MHz
39
Page 40
Presentation for SVC Engineer
Video Processing - VPC3230D
Pin
Pin NameType
No.
1B1/CB1ININVREFBlue1/Cb1 Analog Component Input
2G1/Y1ININVREFGreen1/Y1 Analog Component Input
3R1/CR1ININVREFRed1/Cr1 Analog Component Input
4B2/CB2ININVREFBlue2/Cb2 Analog Component Input
5G2/Y2ININVREFGreen2/Y2 Analog Component Input
6R2/CR2ININVREFRed2/Cr2 Analog Component Input
7 ASGFXAnalog Shield GND F
8NC-LV or GNDNo connected
9V SUPCAPSUPPLYDX
10V SUPD SUPPLYDXSupply Voltage, Digital Circuitry
11GND DSUPPLYDXGround, Digital Circuitry
12GND CAPSUPPLYDXGround, Digital Decoupling Circuitry
13SCLIN/OUTXI 2 C Bus Clock
14SDAIN/OUTXI 2 C Bus Data
15RESQINXReset Input, Active Low
16TESTINGND DTest Pin, connect to GND D
17VGAVINGND DVGAV Input
18YCOEQINV SUPDY/C Output Enable Input, Active Low
19FFIEOUTLVFIFO Input Enable
20FFWEOUTLVFIFO Write Enable
21FFRSTWOUTLVFIFO Reset Write/Read
22FFREOUTLVFIFO Read Enable
23FFOEOUTLVFIFO Output Enable
24CLK20IN/OUTLVMain Clock Output 20.25 MHz
Connection
(if not used)
Short Description
Supply Voltage, Digital Decoupling
Circuitry
Pin
Pin NameType
No.
25GND PA SUPPLYDXGround, Pad Decoupling Circuitry
26V SUPPA SUPPLYDXSupply Voltage, Pad Decoupling Circuitry
27LLC2OUTLVDouble Clock Output
28LLC1IN/OUTLVClock Output
29V SUPLLCSUPPLYDX Supply Voltage, LLC Circuitry
30GND LLC SUPPLYDXGround, LLC Circuitry
31Y7OUTGNDPicture Bus Luma (MSB)
32 Y6OUTGNDPicture Bus Luma
33Y5OUTGNDPicture Bus Luma
34Y4OUTGNDPicture Bus Luma
35GND YSUPPLYDXGround, Luma Output Circuitry
36V SUPY SUPPLYDXSupply Voltage, Luma Output Circuitry
37Y3OUTGNDY Picture Bus Luma
38Y2OUTGNDY Picture Bus Luma
39Y1OUTGNDY Picture Bus Luma
40Y0OUTGNDY Picture Bus Luma(LSB)
41C7OUTGNDPicture Bus Chroma (MSB)
42 C6OUTGNDPicture Bus Chroma
43C5OUTGNDPicture Bus Chroma
44C4OUTGNDPicture Bus Chroma
45V SUPC SUPPLYDXSupply Voltage, Chroma Output Circuitry
46GND CSUPPLYDXGround, Chroma Output Circuitry
47C3OUTGNDPicture Bus Chroma
48C2OUTGNDPicture Bus Chroma
Connection
(if not used)
Short Description
40
Page 41
Presentation for SVC Engineer
Video Processing - VPC3230D
Pin
Pin NameType
No.
49C1OUTGNDPicture Bus Chroma
50C0OUTGNDPicture Bus Chroma(LSB)
51GND SY SUPPLYDXGround, Sync Pad Circuitry
52V SUPSY SUPPLYDXSupply Voltage, Sync Pad Circuitry
53INTLCOUTLVInterlace Output
54AVOOUTLV Active Video Output
55FSY/HCOUTLVFront Sync/ Horizontal Clamp Pulse
56MSY/HSIN/OUTLVMain Sync/Horizontal Sync Pulse
57 VSOUTLVVertical Sync Pulse
58FPDATIN/OUTLVFront-End/ Back-End Data
59V STBYSUPPLYAXStandby Supply Voltage
60CLK5OUTLVCCU 5 MHz Clock Output
61NC-LV or GNDd No connected
62XTAL1INXAnalog Crystal Input
63XTAL2OUTXAnalog Crystal Output
Connection
(if not used)
Short Description
Pin
Pin NameType
No.
71CININLV*Chroma / Analog Video 5 Input
72VIN1INVRT*Video 1 Analog Input
73VIN2INVRTVideo 2 Analog Input
74VIN3INVRTVideo 3 Analog Input
75VIN4INVRTVideo 4 Analog Input
76V SUPAI SUPPLYAX
77GND AISUPPLYAX
78VREFOUTX
79FB1ININVREFFast Blank Input
80AISGND SUPPLYAX
Connection
(if not used)
Short Description
Supply Voltage, Analog Component
Inputs Front-End
Ground, Analog Component Inputs
Front-End
Reference Voltage Top, Analog
Component Inputs Front-End
Signal Ground for Analog Component
Inputs, connect to GND AI
64ASGFXAnalog Shield GND F
65GND FSUPPLYAXGround, Analog Front-End
66VRTOUTXReference Voltage Top, Analog
67I2CSELINX I 2 C Bus Address Select
68ISGNDSUPPLYAX
69V SUPFSUPPLYAXSupply Voltage, Analog Front-End
1NCLVNot connected
2I2C_CLIN/OUTOBLI2Cclock
3I2C_DAIN/OUTOBLI2C data
4I2S_CLIN/OUTLVI2S clock
5I2S_WSIN/OUTLVI2S word strobe
6I2S_DA_OUTOUTLVI2S data output
7 I2S_DA_IN1 INLVI2S1 data input
8ADR_DAOUTLVADR data output
9ADR_WSOUTLVADR word strobe
10ADR_CL SUPPLYDXSupply Voltage, Digital Circuitry
11DVSUPSUPPLYDXGround, Digital Circuitry
12DVSUPSUPPLYDXGround
13DVSUPIN/OUTXI 2 C Bus Clock
14DVSSIN/OUTXI 2 C Bus Data
15DVSSINXReset Input, Active Low
16DVSSINGND DTest Pin, connect to GND D
17I2S_DA_IN2 INGND DVGAV Input
18NCINV SUPDY/C Output Enable Input, Active Low
19NCOUTLVFIFO Input Enable
20NCOUTLVFIFO Write Enable
21RESET_QOUTLVFIFO Reset Write/Read
22NCOUTLVFIFO Read Enable
23NCOUTLVFIFO Output Enable
24DACA_RIN/OUTLVMain Clock Output 20.25 MHz
25DACA_R SUPPLYDXGround
33Y5OUTGNDPicture Bus Luma
34Y4OUTGNDPicture Bus Luma
35GND YSUPPLYDXGround, Luma Output Circuitry
36V SUPY SUPPLYDXSupply Voltage, Luma Output Circuitry
37Y3OUTGNDY Picture Bus Luma
38Y2OUTGNDY Picture Bus Luma
39Y1OUTGNDY Picture Bus Luma
40Y0OUTGNDY Picture Bus Luma(LSB)
41C7OUTGNDPicture Bus Chroma (MSB)
42 C6OUTGNDPicture Bus Chroma
43C5OUTGNDPicture Bus Chroma
44C4OUTGNDPicture Bus Chroma
45V SUPC SUPPLYDXSupply Voltage, Chroma Output Circuitry
46GND CSUPPLYDXGround, Chroma Output Circuitry
47C3OUTGNDPicture Bus Chroma
48C2OUTGNDPicture Bus Chroma
49C1OUTGNDPicture Bus Chroma
50C0OUTGNDPicture Bus Chroma(LSB)
Connection
(if not used)
Short Description
43
Page 44
Presentation for SVC Engineer
Audio Processing - MSP3440G
Pin
Pin NameType
No.
51GND SY SUPPLYDXGround, Sync Pad Circuitry
52V SUPSY SUPPLYDXSupply Voltage, Sync Pad Circuitry
53INTLCOUTLVInterlace Output
54AVOOUTLV Active Video Output
55FSY/HCOUTLVFront Sync/ Horizontal Clamp Pulse
56MSY/HSIN/OUTLVMain Sync/Horizontal Sync Pulse
57 SC1_in_RINLVSCART 1input,right
58VREFTOPOBLReference voltage IF A/D converter
59NCLVNot connected
60MONO_ININLVMono input
61AVSSOBLAnalog ground
62AVSSOBLAnalog ground
63NCLVNot connected
64NCLVNot connected
65AVSUPOBLAnalog power supply 5V